Yarn twister



YARN TWISTER Philippe Boillat and Reinhard Rohrer, Biel, Switzerland,

assignors to Miniatur Kugellager A. G., Biel, Switzerland, a corporationof Switzerland Application February 2, 1954, Serial No. 407,724

Claims priority, application Switzerland February 12, 1953 7 Claims.(Cl. 5777.33)

This invention relates to a yarn twister and more especially to such adevice capable of operating at high rotative speeds while the yarn ispassing therethrough at relatively high linear speeds.

Twister operations at high rotative speeds of the order of 100,000 R. P.M. or higher are particularly useful in false twisting yarn traveling atrelatively high linear speeds to produce a high degree of twist such asis useful in yarn treating processes. Under such conditions there arepresented operational problems of undue wear of the twister and breakageof the yarn.

In general, twisters are provided with a longitudinally extending guideor means to guide yarn fed longitudinally and with means to trap orentrain yarn at a portion of its guide axis path so as to move itangularly about its feed axis and thereby cause it to twist. Heretofore,numerous forms of twisters have been proposed, each presenting one ormore of the following difiiculties which it is the purpose of thisinvention to overcome:

(l) Relatively high cost of manufacture;

(2) Subject to undue wear and breakage of yarn traveling at relativelyhigh speeds;

(3) Requiring interchange of parts in order to vary the twist torque;and

(4) Difficult to thread.

It is an object of this invention to provide a twister of simpleconstruction, economical to manufacture and durable in operation.

Another object is to provide a twister adapted to greatly facilitatethreading and reduce yarn wear and breakage.

A further object is to provide a twister which may be readily adjustedto provide varying degrees of twist torque without the interchange ofparts.

Further and other objects, features and advantages of the invention willmore clearly appear from the detailed description given below, taken inconjunction with the accompanying drawings illustrating, by way ofexample, presently preferred embodiments of the invention, and in which:

Fig. 1 is a longitudinal section taken through the axis of the twister,with certain parts broken away which are not necessary to anunderstanding of the invention;

Fig. 2 is a side view of the device shown in Fig. 1 with the parts in adifferent position of adjustment, as will be more fully explainedhereinafter;

Fig. 3 is a longitudinal sectional view taken at 33 of Fig. 2 withcertain parts eliminated and showing further details of the device ofFigs. 1 and 2;

Fig. 4 is a view similar to Fig. 3 with the parts in a differentpostiion of adjustment;

Fig. 5 is a view similar to Fig. 1 but showing a modified form of theinvention;

Fig. 6 is a longitudinal sectional view taken at 66 of Fig. 5 withcertain parts omitted, and showing the device in one position ofadjustment; and

Fig. 7 is a view similar to Fig. 6 showing the parts in another positionof adjustment.

aren't 2,321,062 Patented Jan. 28, 1958 ice In general, the inventioncomprises a twister body having a longitudinal bore providing a guideaxis coinciding with the linear feed of the yarn through the twister,and an adjustable member disposed in the bore or throat of the twisterbody so constructed and arranged that in one position of adjustment theyarn may be threaded through the twister along its feed axis and inanother position the yarn will be deflected from its feed axis andentrained by said member so that as the twister head rotates theentrained portion of the yarn will be given angular motion about thefeed axis to thereby twist the yarn while it is being fed through saidtwister. The adjustability of the portion disposed within the bore ofthe twister also permits variations of the degree of de fiection andhence variation in the twisting torque.

Referring to the drawings and more particularly to Figs. 1, 2 and 3, thetwister body comprises a shaft 1 which in the present embodiment hassecured thereto a sleeve 2 forming a part thereof to provide anincreased wall thickness for the purposes to be made apparenthereinafter. The body 1 is provided with an axial bore extending in thedirection of the feed axis which is designated I-lI and is preferablyprovided with a sleeve 3 held therein by a press fit and provided with abore centered on the axis III; and with a sleeve 4 spaced axially fromthe sleeve 3 and adjustably disposed therein by screw threads and havinga bore corresponding to that of sleeve 3 and in axial alignmenttherewith. The sleeves 3 and 4 are preferably made of hardened steel andthe bores of sleeves 3 and 4 are chamfered or rounded at their ends toprevent wear of the yarn passing therethrough. The shaft 5 extendstransverse to the body 1 in a direction perpendicular to a plane passingthrough the axis III and the axis of the shaft 5 preferably intersectsthe axis I-II. The opposite ends of the shaft 5 are journaled in thebody wall comprising shaft 1 and sleeve 2 with a relatively tight fit sothat the shaft may be angularly adjustable about its axis. The shaft 5is provided on its opposite ends with slots serving as a means ofengagement from the exterior for adjusting its angular position. Theshaft 5 in the region passing through the axial bore of the body 1 isreduced in diameter as at 5 to provide an annular recess for receivingthe cylindrical end 4' of the threaded sleeve 4 for purposes of securingthe shaft to the body 1 so as to prevent its dislodgment undercentrifugal force due to the high rotational speeds of the body 1 whichis supplied with suitable means to effect such rotation. The sleeve 4 issecured in adjusted position by means of a lock nut 6. The reduceddiameter 5' of shaft 5 is provided with a smooth hole 7 whose axis liesin a plane passing through the feed axis I-II and extends perpendicularto the axis of shaft 5. The hole 7 is chamfered or smoothly rounded atits opposite ends to prevent wear of the yarn. This hole provides aguideway for the yarn fed along the axis III. The yarn is designated YYin Figs. 3, 4, 6

and 7.

In the position of adjustment shown in Fig. 3 the hole 7 is in axialalignment with the axis III so as to facilitate the passage of yarntherethrough in the threading operation, after which the shaft 1 may beangularly adjusted, such as to the position shown in Fig. 4. The portionof the shaft 5 surrounding or defining the guideway 7 provides adeflecting portion for deflecting the yarn from the guide axis tothereby entrain the same and produce twist. This adjustability of theshaft 5, which serves as a twister member, permits the variation of thedegree of offset or decentering of the yarn from the feed axis IH tothereby vary the twisting torque. Indicia marks such as 8, 9 and 10(Fig. 2) are conveniently employed to facilitate proper register of thetwister member in the desired position,

Modification,

A modification of the device is shown in Figs. 5, 6 and 7 in which thestructure is identical with that above described withthe exceptions tobe hereinafter'noted,

a hole 7 as in Fig. 1, the guideway is provided in the.

following manner: The reduced diameter Sa of,the

shaft a is provided with a recess 17 milled or cut there-- in in adirection perpendicular to the axis of shaft 54 and coincident with aplane passing through the feed guide axis which in this embodiment isdesignated II I-'-IV. The recess 17 extends through more than half thediameter of said reduced portion (Figs. 6 and ,7 so that in the positionof adjustment shown'in Fig. 6 the yarn may be freely threaded throughthe recess in a straight line without interference from the twister1116111. ber 'S'a. The remaining portion of the reduced diameter Saserves as the deflecting portion and preferably is provided with asmooth groove 17 formed in its periphery asa continuation of said recess17 and smoothly rounded off Where its ends meet the bottom of the recess17. It will therefore be seen that after the yarn has been threaded thetwister memberSq may be adjusted from the position shown in Fig. 6 to adecentering position, such asthe' position shown in Fig; 7 at which timethe yarn'will pass through the guideway provided by the groovei'T'.

' Having thus described our invention with particularity with referenceto presently preferred embodiments thereof it will be'obvious to thoseskilled in the art, after understanding our invention, that variouschanges and modifications may be made therein without departing from thespirit and scope of our invention, and .we aim in the appended claims tocover such changes and modifications'asfall within the scope of theinvention.

"Whatwe claim is:

1. A yarn'twister cornprising' a rotatable body having an axial boreproviding a guide-axis for-the passage of yarn, a twister member securedto said body for'rotationtherewith -and provided with a deflectingportion disposed within saidbore and adapted to be positioned in aplurality of positions, one wherein yarn may be passed therebyalong-said guide axisffor threading the twister andanother.wherein-'yarn is deflected from'said guide axis 'to' therebyentrain said yarn,- said twister member being mounted for adjustmentrelative-to said body to thereby selectively position said deflectingportion in one or the other of said positions. l I

-2. A yarn twister comprising a rotatable body having an axial boreproviding a guide axis for the passage of yarn, a twister membersecuredto said body for rotation therewith andprovided with a guidewaypositioned within said bore-and coincident with a plane passingthroughsaid guide axis, said'twister member being mounted for angularadjustment relative to said body about an axisextending transverse tosaid bore; theyarn guideway of said twister member having a portionnearer'its axis than another portion, wherebysaid guideway maybe setat=a desired-position to guide said yarn being fed through said twisterout of axial alignment with-said 3. .A yarntwister. comprisingsarotatable body having an axial bore providing a guide axis for thepassage of yarn, a twister member secured to said body for rotationtherewith and provided with a guideway positioned within said bore andcoincidentwith a plane passing through said guide axis, theyarn guidewayof said twister member having a portion nearer its axis than anotherportion, said-twister member being mounted for angular.

adjustmenttrealtive to said body about an. axis extending substantiallyperpendicular to said 'plane to thereby selectivelyv move said guidewayfrom one posiiton where it is in axial alignment with said guide axis toanother position out ofaxialalignment with said guide .axis, wherebysaid guideway may be setiat a desired position to guide said yarn beingfedthroughsaid twister out of axial alignment with said guide axis andthereby twist the same upon rotation of said twister.

4. A .yarn'twister asset forth-in claim "3 wherein (the guideway is inthe, form of p a smooth hole. which: extends throUghsaid. twister memberin a direction transverse to its axis of adjustment. 5. Ayam;twister-.as set forth in claim-3 wherein th guideway is in the form,of a smooth groovedisposedon one side of itsaxis of adjustment and incoplanar align: ment with, said guideaxis and. the opposite side .ofsaid twister member isproyidedwith a recess extendingthe're:

in in a directiontoward said groove andbeyondfthe guide axis,OfigSflllCl yarn in coplanar alignment .With .said.

guideaxisi 6. A yarn.,twister as setforthin claim 3 whereinsaid,twistermember is in the. form of a shaft passing through saidrotatab1ebody in. a direetion perpendicular tothe axis thereof and isfastened, to saidbody by. a sleeve threadingly; e ngaged withinsaidrotatable bodyin an axial. direction andiwhose ;interior-;.diameter isin axial align-q ment withthe; boreiinsaid rotatable bodyv anduin,com-1,

bination therewith serves asaxial guide jforsaidyarn; v

7. A yarn twister comprising a rotatable 'bodyihaving an axial boreprovidinga guide axis ,for the pas'sage of'yarn, a cylindrical memberpassing through said bore and journaled in the opposite walls of saidbody to permit;

angular movement of said cylindrical member, the axis of rotation ofsaidcylindrical :member intersecting the axis of said bore andbeingsubstantiallyperpendicular thereto, an intermediate portion of saidcylindrical mem ber situated within said bore being reducedin diameterand provided with a guideway through which saidyarn,v

is adapted to pass and which guideway is adapted to be positioned by theadjustment of said cylindrical member, a bushing sleeve having a bore inregister with the bore I of said cylindrical member and, provided withexternal threads threadingly; engaged in the. bore of said cylindricalmember and having an inner cylindrical end disposedwithin a.reeess-formed in said cylindrical member by its reduced. diameter.

References Cited in the file of this patent. UNITED STATES PATENTS.

